Update and align w/ standard lesson discussion page

Author: Chris Erdmann

_extras/discuss.md

@@ -3,8 +3,11 @@ layout: page
 title: Discussion
 permalink: /discuss/
 ---
+
 There are many ways to discuss Library Carpentry lessons:
 
-- Join our [Gitter discussion forum]({{ site.contact }}).
+- Join our [Gitter discussion forum](https://gitter.im/LibraryCarpentry/).
+- Join our [Slack organisation](https://swc-slack-invite.herokuapp.com/) and #libraries channel.
+- Stay in touch with our [Topicbox Group](https://carpentries.topicbox.com/groups/discuss-library-carpentry).
 - Follow updates on [Twitter](https://twitter.com/LibCarpentry).
-- Make a suggestion or correct an error by [raising an Issue](https://github.com/data-lessons/library-data-intro/issues).
+- Make a suggestion or correct an error by [raising an Issue](https://github.com/LibraryCarpentry/lc-open-refine/issues).